<html>
  <body>
    <script>
      // 打印出 <div id="hi">Hi</div>
      console.log(document.getElementById("hi"));
    </script>
    <link rel="stylesheet" href="./longtime.css" />
    <!-- div#hi在 ./longtime.css下载完前不会被渲染 -->
    <div id="hi">Hi</div>
  </body>
</html>
